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Fast image display on LCD with prime lenses

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dcdrums

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Hello fellow Pentaxians;

Can someone 'splain to me why an image captured with a prime lens (50mm 1.4 in this case) displays faster on the LCD (K7) than one with a zoom (Sigma 17-70)?

The zoom image takes a couple of seconds to show up and the prime is instantaneous.

Just curious.

Thanks...

-Drew
 
The 50mm 1.4 is faster glass! (very sorry couldn't resist)

Second thought was if you have Lens correction set?
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Good one, I like it!!!! As far as the lens correction goes, I do now, but I noticed it before I made any correction for the lens.
 
Drew just check all corrections/filters etc are off, I wouldn't have thought it should be different without these.
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Regards Dean - Capturing Creation
 
I wouldn't either. The camera is pretty much out of the box stock. If, perchance there was a filter on somewhere, wouldn't it be applied to any image, regardless of the type of lens it was taken with?

I just think it's interesting that images display quicker with my primes than they do wiith my zooms.

As an aside, I've niticed that the front e dial is on the fritz now. It seems that this is an issue with the K7s.
ozdean said:
Drew just check all corrections/filters etc are off, I wouldn't have thought it should be different without these.
--
Regards Dean - Capturing Creation
Click to expand...
 
dcdrums said:
Can someone 'splain to me why an image captured with a prime lens (50mm 1.4 in this case) displays faster on the LCD (K7) than one with a zoom (Sigma 17-70)?

The zoom image takes a couple of seconds to show up and the prime is instantaneous.
Click to expand...
Drew - if you had the lens correction option set it would only work for Pentax lenses, so it wouldn't slow down processing of your Sigma zoom. If your 50/1.4 is Pentax it would slow that down - which is the opposite of what you see.

Scenes that are fairly uniform contain less detail and thertefore their files can be smaller; if it just hapens that you've used your zoom for shots holding a lot more detail, processing the extra detail might take the extra time. If, say, you used the 50 at f/1.4 the background would be smoother than at smaller apertures. It might be interesting to try some shots with different detail to see if it makes a difference.

--
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Gerry


First camera 1953, first Pentax 1983, first DSLR 2006
http://www.pbase.com/gerrywinterbourne
 
When I use manual mode, the front dial does not increment a value correctly. If you have it assigned to change your shutter speed, the speeds jump around eratically no matter which direction you rotate the dial. The shutter speeds will jump from 1/250th to 1/8 to 1/64th, instead of 1/250th to 1/125th to 1/64th, and so on.

I changed the assignment of the dial to aperture and got the same behavior, f2.8 to f4 to f11.

I did find a couple of threads that Brandrx had replied to a while back regarding this same issue with possible fixes.

Are you experiencing this problem, also?
kevinschoenmakers said:
dcdrums said:
As an aside, I've niticed that the front e dial is on the fritz now. It seems that this is an issue with the K7s.
Click to expand...
What do you mean by this?

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http://www.kevinschoenmakers.nl
Click to expand...
 
Hi Gerry;

I did some basic testing with both lenses and shot the same scene. I'll do some more scientific-like testing when I get home tonight and use the same shutter speed/aperture settings for both lenses.

I may try one of my Pentax zooms and see where that takes me. I'll also set the camera back to where I had it before I made the changes, not that I think it will change anything.

BTW - both of my primes are Pentax (28/2.8 and the nifty fifty).

Thanks for all the replies.
Gerry Winterbourne said:
dcdrums said:
Can someone 'splain to me why an image captured with a prime lens (50mm 1.4 in this case) displays faster on the LCD (K7) than one with a zoom (Sigma 17-70)?

The zoom image takes a couple of seconds to show up and the prime is instantaneous.
Click to expand...
Drew - if you had the lens correction option set it would only work for Pentax lenses, so it wouldn't slow down processing of your Sigma zoom. If your 50/1.4 is Pentax it would slow that down - which is the opposite of what you see.

Scenes that are fairly uniform contain less detail and thertefore their files can be smaller; if it just hapens that you've used your zoom for shots holding a lot more detail, processing the extra detail might take the extra time. If, say, you used the 50 at f/1.4 the background would be smoother than at smaller apertures. It might be interesting to try some shots with different detail to see if it makes a difference.

--
---

Gerry


First camera 1953, first Pentax 1983, first DSLR 2006
http://www.pbase.com/gerrywinterbourne
Click to expand...
 
Just wanted to chime in with the OP. I have also noticed that a prime lens image will pop up instantaneously while zoom lens images take several seconds.

My prime is an A 50 1.7. In fact, the first picture I took with it, it stunned me how fast the image popped up since I was so used to having to wait.

I'm also curious why this happens. (Incidentally, I have a K-r, if that makes a difference.)
 
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